Improvement in lifting-jacks



UNITED STATES EEICE.

PATENT VILLIAM TH URBER, OF OLEAN, NEWT YORK.

IMPROVEMENT IN LlFTlNG-JACKS.

To @ZZ whom it may concern.-

Be it known that I, WILLIAM TIIURBER, of Olean, in the county of Cattaraugus and State ot' New York, have invented new and useful Improvements in Lifting-Jacks, and the following is a clear and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l shows a side elevation. Fig. 2 represents a face view. Fig 3 is an under side view.

My invention consists in the arrangement of truck-wheels, a spring-shoe, and calks, on the under side of a bed-piece, for the purpose of moving and easily placing the lifting-,jack in position and anchoring the same firmly by the operation ofthe lifting; also in the arrangenient and combination oi' the hanging rack, the stirrup, supporting-sprin g, and notched lever for changing the fulcrum.

To enable others skilled in the art to make aid use my invention, I will describe it more fully', referring to the drawings and to the letters of reference marked thereon.

My improvements are designed more par. ticularly for what is usually called a wagonjack, but may be applied to a liftingjack for any other purpose. I make my bed-piece A of plank ot convenient length and suitable width to frame in near the front end two vertical posts, B B, the space between them being ofsufiicient width for the slide or liftingpost C, which has its support in the metal guides D D. The face ofthe lifting-post O, I plate with metal d, and have a series of pinlioles,c c c c c, in which to insert apii1,f, to accommodate the height of the article to be lifted. On the rear side ofthe posts B, at the top, is a brace of metal, b, on the center of which is secured a pendent rack, a series of notches or hooks, a a, onto which a link or stirrup j, through which the lever E passes, and to which the stirrup j is attached, the stirrup being Iitted to hook onto the notches a so tha-t,by the action of the supportin g-sprin g e, which is secured to the rear en d ofthe bedpiece A, the forward end of the spring e being and operating in the space between the vertior depressed, so that the notches near the end of the lever will catch the toe-piece g, on the lower end of the lifting'post G, which, by carrying in or out the fulcrum of the lever, is changed for lifting a greater or lesser weight, as required. There is a small spring, b, operating against the link or stirrupj to make it catch onto the rack a a. Near to the rear end ot' the bi d-piece A is a standard, F, it having a series cf holes, 0.o o, to inserta pin p to hold the lever and weight at rest. Just in front ofthe vertical posts B B, on each side ofthe bed-piece A, I place two truckr0llers, I I. Near the axle ofthe rollers on the under side I secure a spring shoe or slide h, which extends back to the rear end of the bed piece A, and when pressed down the spring-shoe h lies in between two calks or short sharp-pointed spikes 7c k.

To place the liftingjack and operate the saine, take hold of the extended portion of the lever E, which, when itis in its place, will serve as the, handle to move and place thejack up to the axle, or anything you wish to lift. Then by bearing down the lever you force the shoe between the pivots, so that they take hold ofthe ground or oor and hold the machine from moving on the rollers.

Having thus fully described my improved lifting-jack, whatI claim as my invention, and desire to secure by Letters Patent, is-

l. The combined arrangement of the truckwheels I I, the spring-shoe h, and pointed spikes k k, operating in the manner as and for the purposes herein set forth.

2. The combination of the hanging rack a, the stirrup 7', the supporting-spring e, and the lever E, with its notches it' z', for changing the fulcrnm to get more or less power on the lever, in the manner herein specified.

WILLIAM THURBER.

Witnesses:

J. B. WOODRUFF, WM. DAvIs. 

